Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Fossil insect eyes shed light on trilobite optics and the arthropod pigment screen
Lund University, Sweden.
Lund University, Sweden.
RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.ORCID-id: 0000-0002-2696-7215
Lund University, Sweden.
Vise andre og tillknytning
2019 (engelsk)Inngår i: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 573, nr 7772, s. 122-125Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Fossilized eyes permit inferences of the visual capacity of extinct arthropods1–3. However, structural and/or chemical modifications as a result of taphonomic and diagenetic processes can alter the original features, thereby necessitating comparisons with modern species. Here we report the detailed molecular composition and microanatomy of the eyes of 54-million-year-old crane-flies, which together provide a proxy for the interpretation of optical systems in some other ancient arthropods. These well-preserved visual organs comprise calcified corneal lenses that are separated by intervening spaces containing eumelanin pigment. We also show that eumelanin is present in the facet walls of living crane-flies, in which it forms the outermost ommatidial pigment shield in compound eyes incorporating a chitinous cornea. To our knowledge, this is the first record of melanic screening pigments in arthropods, and reveals a fossilization mode in insect eyes that involves a decay-resistant biochrome coupled with early diagenetic mineralization of the ommatidial lenses. The demonstrable secondary calcification of lens cuticle that was initially chitinous has implications for the proposed calcitic corneas of trilobites, which we posit are artefacts of preservation rather than a product of in vivo biomineralization4–7. Although trilobite eyes might have been partly mineralized for mechanical strength, a (more likely) organic composition would have enhanced function via gradient-index optics and increased control of lens shape.

sted, utgiver, år, opplag, sider
Nature Publishing Group , 2019. Vol. 573, nr 7772, s. 122-125
HSV kategori
Identifikatorer
URN: urn:nbn:se:ri:diva-39862DOI: 10.1038/s41586-019-1473-zScopus ID: 2-s2.0-85071045838OAI: oai:DiVA.org:ri-39862DiVA, id: diva2:1347176
Merknad

Funding details: Vetenskapsrådet, VR, 642-2014-3773; Funding text 1: C. Tell processed our extant tiger crane-fly samples; R. Hauff and G. Dyke provided comparative ink sacs from fossil squids; and C. Rasmussen prepared the histological sections, performed the Fontana–Masson staining, and assisted during the transmission electron microscopy analysis. Financial support for this project was provided by a Swedish Research Council Grant for Distinguished Young Researchers (642-2014-3773) to J.L.

Tilgjengelig fra: 2019-08-30 Laget: 2019-08-30 Sist oppdatert: 2023-06-05bibliografisk kontrollert

Open Access i DiVA

Fulltekst mangler i DiVA

Andre lenker

Forlagets fulltekstScopus

Person

Sjövall, Peter

Søk i DiVA

Av forfatter/redaktør
Sjövall, Peter
Av organisasjonen
I samme tidsskrift
Nature

Søk utenfor DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric

doi
urn-nbn
Totalt: 27 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
v. 2.41.0